That is true, but a wooden frame attached to the "smaller" excluder can cover that distance. May i ask you what is the aim of placing excluder to your nucs ? I keep a 5frame nuc supering with 5 frame shallows ( my own construction ) , just to see its behaviour, and finally want to see how many frames of honey can be collected from such a nuc during a season.

Interesting idea, how many deeps have you installed ? In my "tower" which consists of 1 5-frame deep and 2 shallows ( for now ) i notice difficulty in development. The brood development in the shallows seem not perfect. Queen do not use all the frame to lay. More deeps are necessary for brood. So you can easily separate this hive and have the nucs made ready to sell. Did you notice to what level of the tower queen lays ? 2-3-4 floor ? In other words how far from the entrance ?

My tower consist of two 5 frame deeps and two shallow honey supers. When the spring honey flow is over I plan to add another 5 frame deep and split one off when it is full. As I said they seem to build up faster in this tower configuration.

Steve

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Are you wanting to limit the brood nest or keep the queen in the hive? I made an excluder by simply cutting down an existing one. I have no idea where to buy one specifically for nucs. The plus feature is that I have enough excluder material left over to make queen retaining entrance blocks so I can stop the colony from leaving with the queen.